How To Repair A Pressure Vessel
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Pressure Vessel Repair based on ASME Viii
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Pressure Vessel Repair based on ASME 8Pressure Vessel Repair based on ASME VIII(OP) We have a thinned downward pressure vessel and equally an firsthand repair, we take installed a patch plate on the thinned down portion. Does ASME permit this repair method for a long term? Or shall I recommend sectional replacement? Where in the ASME lawmaking is this topic discussed? By the way, the operating conditions of the vessel is nigh iv psig and 350 deg C. Red Flag SubmittedThank yous for helping keep Eng-Tips Forums free from inappropriate posts. | Resources Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small-scale batches of thermoplastic parts. Download Now Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part̢۪s function at the center of their design considerations. Download At present Metal 3D press has quickly emerged every bit a key applied science in modern design and manufacturing, so it̢۪s critical educational institutions include it in their curricula to avoid leaving students at a disadvantage as they enter the workforce. Download Now This ebook covers tips for creating and managing workflows, security all-time practices and protection of intellectual holding, Cloud vs. on-premise software solutions, CAD file direction, compliance, and more. Download Now |
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Source: https://www.eng-tips.com/viewthread.cfm?qid=157575
Posted by: youngmansquis1947.blogspot.com
RE: Pressure level Vessel Repair based on ASME VIII
The ASME Boiler and Pressure Vessel Code does not address repairs to inservice vessels. You must become to the National Lath Inspection Code (NB-23) to guide you lot in your repair. You lot would be wise to bank check with your local jurisdiction (Land, Commonwealth or Province, Principal Inspector) before you do anything. If you do it wrong (technique or legal procedure) you could accept a vessel that it is unlawful to operate.
Regards, John
RE: Pressure level Vessel Repair based on ASME Viii
Where in the ASME code is this topic discussed?
Go here for the discussions on boilers and pressure vessels:
Forums > Mechanical Engineers > Activities
Banality and Force per unit area Vessel technology Forum
Regards, John
RE: Force per unit area Vessel Repair based on ASME VIII
Simply a notation, the National Board Inspection Code (NBIC) does not permit external patch plates (see RD 2060). The proper repair is to either weld overlay or utilise a flush patch plate. For an in-service vessel, this work should exist performed by a contractor that has a valid National Board Certificate of Dominance to repair boiler/pressure vessels.
RE: Force per unit area Vessel Repair based on ASME VIII
If I read your post correct----you are playing with fire!
A "scab patch" or surface patch plate is worse and so having a hole in the vessel. If you hole thru under the scab you take fabricated a new problem area. The pressure will extend to a large surface area that may exist weaker then your vessel wall. Depending on what you have in this vessel information technology could let go when the fillet welds break and the contents under the patch flash.
People die from this kind of thing.
RE: Force per unit area Vessel Repair based on ASME VIII
Is this even relevant since his vessel is operating at 4 psig? Was it designed to 15 psig or greater? Is it even ASME code stamped/designed now?
I concur w/ deanc, you are playing w/ fire.
Brian
RE: Pressure Vessel Repair based on ASME VIII
No sure the "playing with fire" warning isn't premature at this signal. Properly designed lap patches are permitted in API-510 and API-653. The 4 psi rating makes me less concerned.
Steve Braune
Tank Industry Consultants
www.tankindustry.com
RE: Pressure Vessel Repair based on ASME Viii
SteveBraune
4psi yeah-maybe not and so much of a problem. 350 C-ouch!--whats in the tank?
Why take a chance? Still bad practice.
RE: Pressure Vessel Repair based on ASME VIII
@virjil:
Did you really mean four psig? Just to make certain.
RE: Pressure Vessel Repair based on ASME Eight
deanc,
Must confess. The 350C didn't sink in. At that temp, i would expect insulation, then delta issue might not exist too bad.
I agree that lap patches could exist poor practice, peculiarly if mis-applied to a high hoop stress awarding. Simply, recognized Codes and Standards permit them when designed properly. Yeah, the high temp issues would still concern me on this one.
Steve Braune
Tank Manufacture Consultants
world wide web.tankindustry.com
RE: Pressure level Vessel Repair based on ASME 8
In addition to the previous coomentary, I would not recommend scab patches as a long term repair for highly corroded areas. When corrosion breaks through the original force per unit area part, ane should expect crevice corrosion to advance corrosion of the patch. This is one of the reasons why I have seen tanks with scab patch on scab patch.
RE: Pressure Vessel Repair based on ASME Viii
Stanweld,
Why non put scab on side of wall that is corroding? Would that soothe your concerns whatsoever?
Steve Braune
Tank Industry Consultants
www.tankindustry.com
RE: Pressure Vessel Repair based on ASME VIII
Steve,
That could work and has often been used to protect against errosion/corrosion. One may too wish to weld build upwardly the corroded area and or apply a corrosion resistant barrier? The scab patches that I referenced have been on the exterior surface and have been washed and so for the sake of expediency and initial lower price so as not to crave draining/cleaning the tank. Tank may remain in service during repair.
RE: Pressure Vessel Repair based on ASME Eight
SteveBraune
Yes,I agree with y'all that in limited applications a lap patch could be OK. Water tank,oil tank,something that could not be drained and properly fixed. Small hole---maybe a coupling per UW-xvi(f)????
Dorsum in the days of rivets,what else could one do? They were however required to be practical from the inside.
It would be a good idea if used,calc. for thickness,utilise plug or slot welds to attach and the outside fillet only to seal.
The big trouble is that scab patches are misused,just sloppy piece of work and are dangerous in many cases. Had to cut as well many of them out and do a proper fix in the past.